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Fair Value of Financial Instruments - Valuation for Level 3 Liabilities (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at beginning of period | $ 9,189,459 | $ 6,624,896 |
Total gains (realized/unrealized) |  |  |
Included in earnings | (282,738) | 39,113 |
Purchases | 0 | 1,472,073 |
Paydowns | (67,880) | (66,144) |
Balance at the end of period | 8,838,841 | 8,069,938 |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liabilities of consolidated VIEs | $ 9,027,733 |  | $ 9,436,421
Consolidated K-Series |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liabilities of consolidated VIEs |  | $ 1,500,000 |

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- Definition Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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